Number of n-digit codewords
Find the number of n-digit codewords from the alphabet {0,1,2,...,9} in which the digits 1,2, and 3 each appear at least once.
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Find the number of n-digit codewords from the alphabet {0,1,2,...,9} in which the digits 1,2, and 3 each appear at least once. I have to use inclusion-exclusion theory.
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